/* reset */
* {
  margin: 0;
  padding: 0;
  border: none;
}
body {
  font-size: 16px;
}
/* content */
body {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #eff0f3;
  overflow: hidden;
}
.card {
  width: 16rem;
  height: auto;
  background-color: white;
  padding: 4rem 4rem;
  box-shadow: 3px 3px 10px 10px rgba(200, 200, 200, 0.3);
  border-radius: 0.2rem 2rem 0.2rem 0.2rem;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 10;
}
.card p {
  font-size: 0.8rem;
  color: #232e4c;
  text-align: center;
  line-height: 1.2rem;
  margin-bottom: 1rem;
}
.card .head-icon {
  margin-bottom: 1rem;
}
.card .title {
  font-size: 1.2rem;
  font-weight: bold;
  margin-bottom: 2.5rem;
}
.card .warming {
  color: orange;
  font-weight: 500;
  margin-bottom: 4rem;
}
.card .btn-default {
  position: relative;
  width: 80%;
  height: 3rem;
  color: white;
  font-weight: bold;
  background-color: #232e4c;
  border-radius: 3px;
  box-shadow: 2px 2px 3px 3px rgba(200, 200, 200, 0.3);
  cursor: pointer;
}
.card .btn-default:active {
  top: 2px;
  right: -2px;
}
.card .close {
  width: 2rem;
  height: 2rem;
  fill: #ccc;
  position: absolute;
  top: 0.8rem;
  right: 0.9rem;
  cursor: pointer;
}
/* snow */
.snow {
  position: absolute;
  width: 5px;
  height: 5px;
  top: -5px;
  background-color: white;
  opacity: 1;
  border-radius: 50%;
  box-shadow: 2px 2px 12px 2px rgba(200, 200, 200, 0.6);
  z-index: 1;
  pointer-events: none;
  animation: fall 10s linear infinite;
}
@keyframes fall {
  to {
    transform: translateY(100vh);
  }
}
